PS2.B: Types of Interactions

Paul Andersen explains how objects interact when touching and at a distance.  Electromagnetic forces are very important when objects are touching and fields explain both electromagnetic and gravitational forces.  The strong and weak nuclear forces can result in radioactive decay.  A brief description of Newton's Law of Universal Gravitation and Coulomb's Law are includes.  A teaching progression from grades K-12 is also included.

SEP1: Asking Questions and Defining Problems

Paul Andersen explains how asking questions is the first step in both science and engineering.  Questions allow scientists to direct inquiry with a goal of understanding the phenomena in the Universe.  Questions allow engineers to define problems that require solutions.